package Recursion.permutation_based;

public class TreeNode {
    int val;
    TreeNode left, right;
    public TreeNode(){};
    public TreeNode(int _val) {val = _val;}
    public TreeNode(int val, TreeNode left, TreeNode right) {
        this.val = val;
        this.left = left;
        this.right = right;
    }
}
